Newbie: Insyde bios question.

I've recently started looking at modding bios/firmwares again.. Things have certainly changed somewhat since the last time that I dabbled (P3/P4 era)!!

Anyway, I've got a "bit of a soft spot" for netbooks.. esp. Acer D255, D270 and the HP mini 210-4000 series.
I've got a few of these from Ebay to experiment with.. I mainly run Linux and wish to see how far I can get with Bios unlocks, modding and eventually coreboot.

The HP minis are quite locked down.. The bios is Insyde, the system is locked to a 32bit OS only (Intel N2800 64bit CPU).
The only way that I can backup/flash the bios with anything "non-OEM" is by unsoldering the flash chip and using a SPI programmer.

I've got a HP mini motherboard on the bench with a soldered SOIC adapter fitted. This allows for easy chip flashing.

QUERY: The actual binary Bios file appears to be encrypted within the supplied HP self extracting archive.
I can access any bios file with Phoenixtool 2.66, but I can't see any obvious way of just extracting the unencrypted bios file (for direct use with a hardware programmer).

Am I just being very "dense" in missing something obvious?? or do I need another tool for this??

I've started with SP55712.exe . This is a self extracting archive which contains 0338DF01.bin [2,294,656 bytes]. (yes, I know it's the 1st bios release.. just somewhere to start..)
I've now found that running Pheonix tools leaves 3 new files in the Bios directory:

RSA.SIG (decryption key??)
SLIC.LOG (lots of good stuff)
0338DF01.bin.DEC [2,097,152 bytes]. I assume that this is the decoded bios?? The size is correct!

I did a quick binary compare between this file and an earlier flashchip dump. There appears to be some minor differences but some key headers appear at identical addresses.